Saw-mill



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SAW MILL. No. 278,064. Patented May 22,1888.

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SAW MILL.

.No. 278,064. Patented May 22,1883.

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UNITED STATES PAT NT OFFICE JESSE WALRATH, OF RACINE, WISCONSIN.

SAW-MILL.

SPECIFICATION forming part of Letters Patent No. 278,064, dated May 22, 1883.

I Application tiled March 9,1883. (No model.)

To all whom it may concern:

Be it known that I, JESSE WALRATII, a citizen of the United States,,residing at Racine, in the county of Racine and State of Wisconsin, have invented certain new and useful Improvements in Saw-Mills; and I do hereby declare the following to be afull, clear, and exact description of the invention, such as will enable others skilled in the art to which itappertains to make and use the same,reference .beinghad to the accompanying drawings, and

to the letters or figures of reference marked thereon, which form a part ofthis specification.

The invention I hereinafter described and claimed was made with the specialview of improving a circular-saw mill which operates with two' circular saws rotating in the same vertical plane, and the feed mechanism of which is end of the shaftof the friction-driver in a box carried by a spring-arm,which normally holds the friction-driver out of contact, but may be bent to establish contact between the frictiondriver and the driven friction'pulley; also, of

certain devices foradjusting the belt-tighteners, especially with a view of counteracting the tendency of the belts to run toward the edge of the pulleys and to keep the beltin the center of the pulleys.

In order that my invention may be clearly understood, [have illustrated in the annexed drawings and will proceed to describe the best form thereof at present known to me as applied to such a saw-mill as above mentioned.

Figurel is a perspective view of such a circular-saw mill, only such parts of the machine being shown as are necessary to give a clear understanding of the invention. Figs. 2 to 7 illustrate details of the machine, drawn on a larger scale than Fig. 1.

The same letters of reference indicate identical parts in all of the figures.

The arbor B of the lower saw, A, is driven by apulley, G, by means of a belt (not shown) from a line-shaft or any suitable motor. The arbor B is provided with cone-pulleys D, from which a belt, E, runs toreverse cone-pulleys pulleys and belt.

naled atone end' in a fixed box mounted on F on counter-shaft G, which is continuously rotated through the intervention of said cone- The counter-shaft G isjourthe frame-work of the machine. Its other end is journaled in a box, G, secured to the free end of a stiff barspring, H, the other end of which is firmly secured to the frame-work of the machine. A frictiondriver, l, is keyed to the counter-shaft G in close proximity to its yielding box G. The friction-driver runs just above a friction-pulley, J, on the shaft K,

which transmits motion to the feed mechanism. The bar-spring H normally holds the friction-driver I just out of contact; but the box G"may be depressed against the stress of the bar-spring, so as to establish driving contact between the friction-driver 'and the friction-pulley J by a toe, l, on a hand-lever, L,

fulcrumed on the standard near the box G,

and provided with a suitablelatch mechanism vto lockit at any point to the rack on said standard. The hand-lever L is provided with an arm, L, which carries abelt-tightener, L adapted to tighten a. belt, L running from a pulley on the-arbor B to a pulley on the shaft K. 'It will be seen that the toe Z and the arm L. project in opposite directions from the hand-lever, so that belt L v is slackened when the frictiou-driveris' forced into contact with the pulley J, and, reversely, pulley J is re lieved from the friction-driver when belt L G in bringing together and separating the friction-driver and pulleyJ is so slight that the alignment of the shaft and its boxes will not be disturbed to such an extent as to result in undue heating and wearing of the parts.

The belt for driving pulley O of the arbor of the lo *er saw is tightened by a belt-tightener, M, hung in a yoke,1\l, which is centrally pivoted to a cross-head, N. The yoke of this belt-tighteuerlll may be turned to a limited extent on the cross-head, so as to throw the ti ghtener-pulley at an angle in either direction, as indicated in Fig. 4, and may be secured to the cross-head after proper adjustment. To this end the yoke M is provided with acouple of bolts, m, which pass up through cross-slots in the cross-head, and are provided with nuts to clamp the yoke'in any desirable position to the cross-head. By thus throwing the tight- IOC ener-pulley into an oblique angle to the beltit will counteract the tendency of the latter to run to the edge of the pulley G, and compelit to run on the center thereof. Gross-head Nis mounted on vertical guides, and supported by a screw, 0, the lower end of which also serves as the pivot for the yoke M. The screw is suspended from a cross-beam of the tightenerframe, and operated by the following means: A hand-wheel, 1 is slipped on the upper end of the screw above the supporting-beam, being constructed with a hub, P, the upper flanged end of which contains a recess for receiving an angular nut, Q, screwed on the screw. The lower end of the huh I is constructed with notches, as shown best inFig. 5, so as to form a male clutch-section, which is engaged by the projections on a corresponding. female clutch-section, P which is also slipped on the screw, and projects into the supporting-beam from the under side,its lower end being provided with a flange, in the lower face of which a recess is formed to receive and hold a nut, R, screwed on screw 0. \Vhen the parts are connected the respective nuts are held in the recesses of the hand-wheel and female clutch, respectively, and the clutch-see tions interloeked,so that by turning the handwheel the screw can be run up and down to adjustthe belt-tightener.

The arbor of the upper saw, S, is provided with apulley, T, for driving it by means of-a belt from a pulley, U, on the arbor of the lower saw. This driving-belt is tightened by a belttightener pulley, V, journaled to a yoke, V, which is pivoted to the stud \V, projecting from the main frame of the machine. In order that this belt-tightener mayalso be thrown into an oblique angle to the belt, so as to compel the latter to run on the center of the pulleys T and U, I provide for the adjustment of the yoke with reference to the supporting-stud by the following means: The stem of the yoke is constructed with a disk across the face, ad-

' 5 jacent to the supporting-stud of which is formed a vertical oar, semicircular in crosssection, fitting a semicircular groove in adisk, V in the opposite face of which disk is another semicircular groove at right angles to the former, as shown in Fig. 7. The hub e terminates at its outer end in a disk, 02, across the face of which runs a horizontal bar, fitting the horizontal recess in the disk V a circular recess being out in the outer face of the disk 0, around the bore of the hub, for the reception of the head of supporting-stud N. The yoke, disk V and hub v are bolted together by a series of bolts, so as to form a rigid structure when thus bolted together. By loosening the nuts of the bolts the yoke may be adjusted on its hub so as to swing the axis of the tightener-pulley either in a vertical or in a horizontal direction, or both, thus providing for all necessary adjustments. This pivoted belt-tightener may be turned on stud W by means such as shown in Fig.1,or by any other suitable means.

' it is obvious that instead of the hand-wheel P a lever-arm may be used to turn the clutch and nuts.

Having thus described my invention, what set forth, of a belt-tightener pulley, a yoke in V which it is journaled, and means, substantially such as described, for adjusting the yoke, so that the tightener-pulley may be thrown into an oblique angle across the belt.

at. The'combination, substantially as before set forth, of the sliding belt-tightener, the screw for moving it, the cross-beam, the clutch, and the two nuts.

In testimony whereof I affix my signature in presence of two witnesses.

, JESSE XVALRATH. \Vitnesses:

CHARLES H. LEE, ED. WEAVER. 

